JPS6253341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a filled tire in which the tire is filled with an elastic material such as polyurethane.

Urethane-filled tires are generally manufactured by injecting a liquid puncture-preventing filler made of polyurethane or the like into an air chamber of a tire filled with air to a constant pressure while replacing the air with air. Most of them are used in tubeless tires for trucks and buses, but recently, tubeless tires filled with the above-mentioned filler have also been proposed. A problem in manufacturing such filled tires is the provision of holes to bleed air to replace the liquid filler, which in traditional manufacturing methods would normally be located outside the tire tread. A drill is used to drill through the hole to the tire air chamber, and measures are taken to close it again after filling with liquid filler.

In the case of tires with tubes, these air vent holes are drilled through the tire and tube at the same time after the inner surface of the tire and the outer surface of the tube are glued together. When bonding with an adhesive is not performed, after drilling a hole, the exhaust pipe is provided in the hole so as to pass through the hole from the inside to the outside. However, with these conventional methods, the former requires a troublesome process of adhesion between the tire and the tube, and the latter often causes the tube to tear when drilling because it is not adhesively processed. It happens. Moreover, the biggest problem is that as the through holes are provided in the tread as mentioned above, the tire reinforcing layer may be damaged due to this piercing work, or water may enter through the through holes during use, which may extend the lifespan of the tire. This means that the Particularly when the tire reinforcing layer is made of steel cord, this will lead to rusting and will further shorten the life of the tire.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional problems and improve productivity by eliminating much of the labor and time associated with drilling holes in the tread of a tire; It is an object of the present invention to provide a method for manufacturing a filled tire that does not cause a reduction in service life.

A method for manufacturing a filled tire according to the present invention that achieves the above object includes filling air through a filling valve that communicates with an air chamber of a tire mounted on a wheel rim, and inserting air into the filling valve so as to penetrate an exhaust pipe. The opening at the tip faces the inner circumferential surface of the tire, while the end located outside the tire is provided with a relief valve that maintains the filling air pressure in the air chamber constant, and the tire is connected to the exhaust pipe. The liquid filling material is injected into the air chamber from the filling valve with the tip opening positioned at the top of the air chamber, and the air in the air chamber is exhausted through the exhaust pipe. When the liquid filler starts to overflow from the tire, the injection of the liquid filler is stopped, and then the exhaust pipe is pulled out from the filling valve and its insertion hole is closed. The liquid filler is injected into the tire until it reaches a specified internal pressure, and then the liquid filler in the tire is cured.

The method of the present invention will be explained below using examples shown in the figures.

The figure shows a longitudinal cross-sectional view of a tubed tire for trucks and buses in which the method for manufacturing a filled tire of the present invention is carried out.

In the figure, 1 is a tire, 2 is a tube, and 3 is a flap.
The flap 3 is integrally attached to the outer periphery of the wheel rim 4. Tube 2 has a filling valve 2a
The filling valve 2a is set to protrude outward through an opening 4a formed in the flat bottom of the wheel rim 4. The filling valve 2a has a larger diameter (8 to 12 mm) than those commonly used in the past, and has a straight shape with no bends. A plug (not shown) and a two-port connector 5 are attached to the outer end of such a filling valve 2a. Openings 5a and 5b of the two-port connector 5
An exhaust pipe 6 is inserted into an opening 5a that is in a linear positional relationship with the filling valve 2a so as to pass through the two-port connector and the filling valve 2a. A relief valve 9 is connected via a hose 8 to the outer end 6b of the exhaust pipe 6, which is close to the inner surface of the tube 2 that enters the air chamber 7 and is in close contact with the inner wall surface of the tire 1. On the other hand, a filling device (not shown) for liquid puncture-preventing filler is connected to the other opening 5b of the two-port connector 5 via a hose 10. Since it is necessary to maintain the air chamber 7 at a constant pressure to prevent the relief valve 9 from sagging due to contraction of the tube 2, it is preferable to set the pressure to a minimum of 0.5 kg/ ^cm2 , and the internal pressure may become too high. Since this decreases the filling efficiency of the liquid filler, it is preferable to adjust the set pressure to a maximum of 2.0 Kg/cm ² .

To set up each mechanism as described above,
First, the tire 1, tube 2, and flap 3 are assembled on the wheel rim 4 by the same operations as those for pneumatic tires. Next, a plug (not shown) and a two-port connector 5 are attached to the filling valve 2a, and air is filled into the air chamber 7 at a specified air pressure through the filling valve 2a, and the tube 2 is attached to the inner wall surface of the tire 1. Bring it into close contact. Next, the tire is placed in an upright position, and the filling valve 2a is placed at the highest position. While maintaining this state, connect the exhaust pipe 6 from the opening 5a of the two-port connector 5.
, and push it through the filling valve 2a until its tip opening 6a reaches the top position of the air chamber 7. The outer end 6b of the exhaust pipe 6 is connected to a relief valve 9 through a hose 8. Also,
A liquid filling material is connected to the opening 5b of the two-port connector 5 to a filling device (not shown) via a hose 10.

In order to fill the air chamber 7 with the liquid filler 11 in the above-mentioned state, the pot provided on the filling valve 2a is opened and the liquid filler 11 is press-fitted through the opening 5b. Set pressure of relief valve 9 to 1.0, for example.
Kg/cm ² , when the internal pressure of the air chamber 7 becomes 1.0 Kg/cm ² or more due to the injection of the liquid filler 11, the air passes through the exhaust pipe 6 to the outer end 6b and exits from the relief valve 9. be discharged. Liquid filler 11
When the air chamber 7 is filled with air and begins to overflow from the tip opening 6a into the exhaust pipe 6, the tip opening 6
Since a is at the top position of the air chamber 7, it is no longer the air chamber 7.
There is no air inside. Therefore, at this point, the operation of the filling device is stopped, and the supply of liquid filling material from the filling valve 2a is stopped, and at the same time,
Quickly pull out the exhaust pipe 6 from the 2-port connector 5,
The opening 5a, which is the insertion hole, is closed with a plug 12.

After the exhaust pipe 6 has been pulled out and the opening 5a has been closed, the filling valve 2a is opened again, the filling device is operated, and the liquid filling material is poured into the air chamber 7.
Continue pressing until the specified tire pressure is reached. When the tire reaches a predetermined pressure, the filling device is stopped, the pot is closed, and the hose 10 is removed. The tire filled with the liquid filler is then left as it is at room temperature to allow the liquid filler to harden naturally, or it is placed in a heating room to heat and harden to form a completely filled tire.

Although the embodiments described above have been described with respect to filled tires with tubes, they can also be implemented with tubeless tires.

According to the method for manufacturing a filled tire described above, unlike the conventional method, there is no need to drill through holes in the tread for air venting, so there is no need to bond the tire and tube in order to provide such through holes. Otherwise, there are no problems such as tearing of the tube when such adhesion is not performed.Furthermore, since there are no through holes in the tread, there is no risk of damage to the tire reinforcing layer or reinforcement of the tire due to water entering through the through holes during use. It does not cause layer changes and does not reduce tire life.

As described above, the method for manufacturing a filled tire according to the present invention includes filling air through a filling valve communicating with an air chamber of a tire mounted on a wheel rim, and inserting air into the filling valve so as to pass through an exhaust pipe. The opening at the tip faces the inner circumferential surface of the tire, while the end located outside the tire is provided with a relief valve that maintains the filling air pressure in the air chamber constant, and the tire is connected to the exhaust pipe. The liquid filling material is injected into the air chamber from the filling valve with the tip opening positioned at the top of the air chamber, and the air in the air chamber is exhausted through the exhaust pipe. When the liquid filler starts to overflow from the tire, the injection of the liquid filler is stopped, and then the exhaust pipe is pulled out from the filling valve and the insertion hole is closed. In this method, the liquid filler is injected until it reaches the specified internal pressure of the tire, and then the liquid filler in the tire is cured. Therefore, the liquid filler is injected into the tire through the exhaust pipe that penetrates the filling valve without drilling a tread through hole in the tire. The air is replaced with air, which eliminates the need to drill through holes in the tread and the associated work, improving productivity.
Moreover, damage and deterioration of the tire reinforcing layer due to the through holes in the tread are not caused, and the life of the tire can be improved.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view of a tire implementing the method of the invention. 1... Tire, 2... Tube, 2a... Filling valve, 4... Wheel rim, 5... 2-port connector, 5a, 5b... Opening, 6... Exhaust pipe, 7
...Air chamber, 6a...Tip opening, 6b...Outside end, 9...Relief valve, 11...Liquid filler, 12...Plug.

Claims (1)

[Claims] 1 Fill with air through a filling valve that communicates with the air chamber of the tire attached to the wheel rim, and insert the filling valve so as to penetrate through the exhaust pipe, so that the opening at its tip faces the inner peripheral surface of the tire. On the other hand, a relief valve for keeping the filling air pressure in the air chamber constant is provided at the end located on the outside of the tire, and the tire is erected so that the tip opening of the exhaust pipe is located at the top of the air chamber. In this state, the liquid filling material is injected into the air chamber from the filling valve, and the air in the air chamber is exhausted through the exhaust pipe, and when the liquid filling material overflows from the exhaust pipe, the liquid filling material is After the injection of material is stopped, the exhaust pipe is pulled out from the filling valve and its insertion hole is closed, and the liquid filling material is again injected from the filling valve until the specified internal pressure of the tire is reached. A method for manufacturing a filled tire, comprising curing a liquid filler.